Distance-Dependent PRS Configuration for Near-Field UE Positioning
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Solution Overview
Problem
Existing wireless communication systems struggle to accurately determine the location of mobile devices operating in near-field operational distances from base stations, where near-field effects such as RF signal curvature affect measurement accuracy.
Innovation Solution
Implementing distance-dependent position reference signal (PRS) resource sets that configure UEs to measure different PRS resource sets based on their estimated distance from the base station, allowing for accurate positioning even in near-field operational distances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional positioning methods are used assuming far-field transmission, then positioning is simplified, but measurement accuracy deteriorates in near-field operational distances
Solution Approach 1:
The positioning system is segmented into multiple PRS resource sets, each configured for specific distance ranges. The location server divides the positioning task by selecting appropriate PRS resource sets based on the UE's estimated distance, allowing accurate near-field positioning while maintaining simple far-field operation through the same framework.
Solution Approach 2:
The system dynamically adapts the positioning configuration based on the UE's distance from the TRP. The location server estimates the distance and selectively activates appropriate PRS resource sets, making the positioning system flexible and accurate across varying operational distances without requiring completely different positioning architectures.
2Reliability
If distance-dependent PRS resource sets are implemented, then near-field positioning accuracy is improved, but configuration complexity increases
Solution Approach 1:
Multiple PRS resource sets are pre-configured with different parameters suitable for different distance ranges. The location server has these configurations ready in advance and simply selects the appropriate pre-configured set based on distance estimation, avoiding complex real-time calculations and simplifying the operational complexity.
Solution Approach 2:
Different PRS resource sets use different configuration parameters (such as resource element patterns, time/frequency resources, or signal characteristics) optimized for specific distance ranges. By changing parameters based on distance rather than redesigning the entire positioning system, the patent achieves high near-field reliability while controlling configuration complexity.
Data Source
AI summary
An example method for distance-dependent positioning of a user device (UE) performed by a transmission/reception point (TRP), the method comprising: receiving, from a location server, a first configuration for distance-dependent position reference signal (PRS) resource sets at the TRP, wherein the distance-dependent PRS resource sets comprising at least: a first PRS resource set for positioning the UE when an estimated distance between the UE and the TRP is within a first range interval; and sending, to the UE, a PRS resource set corresponding to the estimated distance between the UE and the TRP.